At&T would never ask for your SS#. That is why you have an account number and a phone number. These are not AT&T people, they are trying to get your SS# to use against you or to scam the IRS.
This company claims to be a representative of AT&T but can't give you any information until you give them your address or SSI number. They have called many times with the same thing trying to get you to give them personal information before they can tell you why they called. They call in with different numbers same spiel (206) 962-8367 & (206) 962-8377. Be very careful they are real scam artists trying to get your information.
At&T would never ask for your SS#. That is why you have an account number and a phone number. These are not AT&T people, they are trying to get your SS# to use against you or to scam the IRS.